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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b093cc26349e7272684055b319893bb595d3a496a9654fdc7000fc4e5af4de18' 
  AND token = '6mAWkB4C0aNyFg5DNhfEWX5YgBdxsDnyVp00jNq8shY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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