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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40daa6f2e3a909e19e80d6252d17f4b1a9f9aeb5109b5554643f93b7b31b3c0d' 
  AND token = 'bBPAumrfBwmJIQz3DIT6nnXx/5pejRKcHtLlyPlkze8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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