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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60c821dec401ea5fc0fcbc7b5a0223c3187fbab90dad763ff72f15407836d34d' 
  AND token = '2cUo04GDZGlHDheg3z38hn/uEuEwliOHIE3LlMkFmQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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