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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df629e79dec23c8ba350012ee07aa8b48f41e7bb602e470b1dfdc6e9aee7ab7' 
  AND token = 'WpeYM1brYvJONrXyTHKimICivbAi3jxdBw3EUyXPENc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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