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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '859f7bc1d3eb205096c6e19179c1a4d6eb2629015dab1b59c89118875510b0e2' 
  AND token = 'YwdCPzZ9pEkpJ6RbO5rIobfMYfDC0IKQ04L6pDseN+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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