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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b37d6916dcba85cddcab1fca42da652ae83728f06748a8f3f1ff432a127f41b4' 
  AND token = 'QnCjqT0ixrEClPjP1Cv111Np6maATtu6nzlPzbtqD3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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