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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7723ff3238182d08b872d0a8fe12dd066d82d6595f3476916e2f0074343600d3' 
  AND token = 'Q155rRH+yv8604hZrWVEoRYzFeejZa8AGr14YzXSns4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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