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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc7af59d0f4bec26e2f80a1da7a554d6a0ff7e307084b0a637c6ee304ad4977f' 
  AND token = '+X0e8aW5f5AbXRNsEjENejUhyPmIN20tF2BJ50PFuZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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