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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bffbfb3ec935fc14c39e067478de5a189c1d7649a1f05f73e46c5a147e0709d4' 
  AND token = '7ZmNVrzAXo5OQj/2lrYs92nz0TfPfSee8H2B2yBydNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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