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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be5fa1122cec0340d766122a80b310a643950e7bc2b7d37c52f0a992b63c57c2' 
  AND token = 'qHjeZSzaDBkyop5jd59J37IZXBAGO/2YMpungM7QFoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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