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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf41ddc5fc5620b9d5f03956b925f6b5e31c883c73415a74a562b6e11374ccc5' 
  AND token = 'sVGlKfRTgTvXAdG0uXCYo34GK4TveCLKZm6APo308Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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