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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6ac7a63a781014e6b4e6db6f5f7655a330fbe50ecbe4b21bbb1e0302c4073b1' 
  AND token = 'u2Fc3TvAGrczmPcUlbRuttXpMfq3QLfUoNyBrWfFtYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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