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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42c4ff8b5c21e9c9f5526cc0be88442c6ee9eb2f2097218acedbc82e1e7b31c6' 
  AND token = 'P1BGhjfrhIjptlHm1Tv/lE/jWVB5aA8cmAeHS/nB1No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}