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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7ed22cb2297a86fec27da28b61a359acc72b461f69c805d5718bb37dbdcdd7' 
  AND token = 'XADRMw0N07TWJ4HIAAVNoRwyj+mM6EzkPDFFqIjgrr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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