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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '239e41ce98903f6b1c8c944c55c291040495bdda8f3bd6303937834d1108c10c' 
  AND token = 'xFRHCvCtOy+CXiKnG2qnSZrPSeGC6MHrT05t+JOCrYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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