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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6021fb9bbbd15ae45570b5aebe8bf234cfb9fc064a863aa3b6fde7c27451e820' 
  AND token = '/SGQpkYTrio3qd4/D35Oz/bE83liVvpRDerS+2nvEjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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