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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '947b1168964506e5815e74d5d3dbdec36d0d6f02e0fb677b0446cd97f42d5aa7' 
  AND token = '4WnXtuzWGuBamNZmE6A9ADS/j+AfB/fwUOntHqVMb3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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