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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7adc6ab1872c0a7697d1692aa272de53264947879f555cafd57648cf09e752f4' 
  AND token = 'kLfZDtW1JEHr0Y6sHSGuQFNPmeq1utym/lzqDNg2mn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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