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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b38b0f62d24db9352f376099bf42373e00333466f9afeb803a95cf6ab0869a5b' 
  AND token = 'EVhqYwPDxMp0hHmExN4dJd8Q/9b8X1ixl/Z4HdwO3yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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