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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0de1605e17cdd71b1d57f54003a4fd68ed02ba4d3a3aaab6b2b8ea13a98d5c9e' 
  AND token = 'fE7Zn/LTZiEX4w2pI2DDOnI2wqS5+UbAa5CaOHJ//CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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