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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d6308db6b28f88fad9e92bd29094b18d5e94685c9252d1f1be4805952d579fe' 
  AND token = 'd3Ob72iOvmzkPmwzB+kSbB/eSbiDl1878ap6o2MUjXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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