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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c55f3a59739f80f763b02d2fe314e0f4ec9dfe0085831043bd10c10060ab3c' 
  AND token = 'qgHgC5EcRBZy3mbtp9OJkqDbqQjzIOMBz+B4KN3zWDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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