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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f77a8823212042c5834ef9a3edf3be5b7c29df843445a242f6b657ae59c7eb' 
  AND token = 'INR5qzB4Diik3tchrDz0PVX4FpRVxbDeHC7Npw+wSOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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