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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd8e9d8dc09d58f0285bad58f617dc0c0cd67c9ff993809dc0f13f8e8570b49e' 
  AND token = 'fylkA6MedMaZnMRI9FdMC2YIqVQ6scoUq9G2P2ndPRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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