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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44dfced8190d14d7489ee2e79f88d8aa5f2fd6e4885da6748fe90e5a4c2c20a6' 
  AND token = 'DZb3mQwQgkhJXCc30ITIclIpJcmTyotykSI4RdkhMUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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