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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60bcbae06f2ad89c51d641bc68f5e55987398f9e8325e7b66da2fc33b135030f' 
  AND token = 'hSF6pIAZ2vFQgUffo2VrwiyyHIXh4oEFAGlMb6ye0JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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