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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ae58033a5ca0bbdfa1d4c885070f297638e1b9ddd725f86230155ca0b1d3a6f' 
  AND token = 'jaQ+5oLPKZ4BnDqvbeaeNBTUxchz0AzHbn6ng/o6avo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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