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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7751ef09816f598b33503f69a421f265f9eedaf607c2fb92709221721d11ed36' 
  AND token = 'sIZNnT7kEFiOv/qsOakLUBu7ASV0Cbef/gpvs3t8YvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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