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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfdf4fe5c728a113fc3c74bde6f8b843eaa79e2c911d0f9a6b8b8f010eebf13c' 
  AND token = 'tqv2fw+ajCEqOc6Pnqr81ccFImLCCIbuiZODQ3rDEoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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