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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '164e6058b02f970336e027dc36120a2e3683369837e767bb9bb37cf7d32a7c61' 
  AND token = '8RvSnG/qdcNWuUMC0ofF++I7j4K49Xlhzm7MjkxSHFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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