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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff1eb9c355a006c3fba306ffb07016008e58875cee15fdf00e0b48bec4cb4ed8' 
  AND token = 'QmjJHCG7Qll+LwdGExNh4oxgGd74cJ0wnzpX8Y03Ojk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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