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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ee2d7d6a7fbe2d56b3c484d06f06a00517dcba56181a7653ec488a8e32d838e' 
  AND token = '7GspMsqS1y1XY+xAudXrS4H2vjLpFr22OueugGnGNPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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