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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f2e73794d79b4b67de4a5c1911e2be3255b601f00c379718b86201ed3c1fccf' 
  AND token = '3y7ETItF7SoHHQoMFgrKmCAOPTMx1Sj5jg920VeX1g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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