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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c473a7b88da250f0bb089cc0e2cf029fd5464fbea7f57a6a936e390f163f318e' 
  AND token = 'qCDBy9IsIBs+oseLdpnF2Yec0KwOGO7JC7CTnpJWeRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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