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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5b1664d8caec587c977c0443a76ebfc70dc05323370adc1d4aa02e4cf4cc22c' 
  AND token = 'hNYwYLKw+PU3Sh+yW7Z38Xc6oEyQaUKB7s5wVCBJVJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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