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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '828804e811faa531d6d42bdca22a4693a7183198104d33cd5111f0b2c6d4fd5b' 
  AND token = 'vRsmYFU8m9nOmfCV9MEOG0+WD1ja1vnP7nmpiuAbqbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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