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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9389d98849d0d8d49eb0bf504ed23e1755cf2844eedd1657bc499169fbc2fdf0' 
  AND token = 'm5/Pa/cJlUvPpy3FqbFt2cjWyOcOq/SJJpHI2KE19+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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