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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '690ebdcab0fe69bac06a4e786b66b6b8b66d95a64f7a3e33964a4093f7313860' 
  AND token = 'MTbnn8sHy+u7o4GrVQUB7n0fjaYKxFJKl22Q2zWVDv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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