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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71cf6f1a5efca20256f4ab0ab79469be88b5f877398d7b5d63982d0361336e62' 
  AND token = '954ELm5zbPPhMAiUWePX1LPXQOjnqHZ9wkKai7O87IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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