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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53a0df3f9cee686a6f8a6261fa20b7523800687a16e460eae617ef7653a61570' 
  AND token = 'NdwZ2zZro8DoQp2FD3yeIPhuqnrsYpD25Fk9M3gZ/Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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