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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3567f34bcb9df9f914e9910a8e746381bfaea655c1ab0b0b73e9e25c21ca8bc' 
  AND token = 'vL0Hul2WhceJVQa9v+rBgPXJavy6KW11BXUa9tTYWS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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