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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c774b4d8c46322fef14b6227007585c656a7a6d365835e9eb36f1105581f1315' 
  AND token = 'jVTBJiE5PbagLKHYI95ZcSLRj7tirMr5GOt0dcx2CwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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