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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c32e50aea306a02b1f74b00af3eeea5c117fe40b02188ee9829757569a18f03' 
  AND token = 'Rm+Vzk3S1mF0VGJbyexQ4XJO6JSHVe7dSzCHMJyXi2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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