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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf235a1ce7230f45ca1228a8160c04ae9dcab59375d24c18b0dfb3a8c527a979' 
  AND token = 'B+Ex2PAW5SZO1bbYfXhgSn2e7QY9YLQLLU/HL4olOsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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