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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '246707444f70c74be0598d676ccd2bcc48ba259dd3c6b4a4d4e145064866883c' 
  AND token = 'qE085HrGvaH4gnfCWOMpnfAcH8+9xYBFLjH62L5VIQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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