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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b285d0602f15ee7a93485f9e259389c9930c3b07ae6aa3b99f029861be267923' 
  AND token = 'UrFNBP51ZMOpgBmg4Yf14k9ZxgtJNVgll6CpEhnWKcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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