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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2df6621fa593ef7a5c2f4d01d652bf280ce309d86fedac3e8ecde07ec9a6bf5' 
  AND token = '1GW7RNy+i+PVL9a1sjJozqGiZ8ZIZ03/eAxRVtXWrZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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