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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1144e4508ad21f172e4d354557e115a5b068cbad32852dfdc9da0b3a817f4774' 
  AND token = 'h/fnn44SS2CgWrMAV17kQbnBs9aiEeTxYEhbp/aIZVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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