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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5df4e092bf567ee4b6611bd4b3f5a37ef502ced1cc3b14bfe302c3b50748ff9c' 
  AND token = 'i/riIEq9J8z/XiiNnEGoG9kQSGVimt90uDUosoXveOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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