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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed2a2000f355990d9f8f70dcff76dd324da3436946b6b28f4b74d5b5e0974a69' 
  AND token = 'ZNUFDn57Ehfjrb3QhQPyQuCFdU98aFeHpG/1WWG+Gy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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