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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe87cdf6df34e400cbee9aca0ff066937b821bebcdee54859d8f33276839d4c' 
  AND token = 'QoJ8A2Pf0MzJkS19l/7qVodKrIoalfmOVknLRFhG6y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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